About: http://webisa.webdatacommons.org/374740931

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Umbrella valve 2508 is preferably made of a material which is more rigid when thick and somewhat flexible when thin, such as silicone, so that thin flap 2518 is somewhat elastic.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk